Crushing-roller.



M. A. SMITH.

URUSHING ROLLER.

APPLICATION FILED 00T. 21, 191s.

l To Patented Mar. 3. 19H1 TNESSES:

QWZ mmm i P BY C2/W @@ATTORNEY MXRON A. SMITH, 0F ROCKVILLE CENTER, NEW' YORK.

CRUSHIIll'G-ROLLER.

Specification of Letters Pete-nt.

inermi..

Patenten Mar. a, 1ere. Y

Application led October 21, 19,13. Serial No. 796,422.

used for granulating material, forcnannile,A

chocolate or for other similar purposes.

Heretofore such rollers have been made oi chilled cast iron and bored out so to form a chamber into which cooling Water was ad niittcd and circulated for the purpose of coolinpY the roller, as the same becomes heated by friction. The cooling water cools the circumferential or cylindrical part of the roller between the ends, but on account of the greater mass of iron at the ends, the ends do not become cooled t0 the extent oi the central. part, which sets up an uneven expansion and contract-ion in the roller 'and as a result thereol.' the periphery is no longer true and the roller docs not crush or grind properly and inust eventually be Vstopped to permit it to cool as otherwise such irregular expansion constantly brings the roller to a still greater extent out. of true until it is practicaliy 'Worthless as a grinder, for the time being` The object of my invention is to provide a new and iinprovedvgrinder or crushing roller which is so constructed that the cooling Water cannot affect it in such a manner that a variable expansion or contraction docs not take place in the different parts oi the roller, but on the contrary the cooling eiicct is uniform throughout the entire roller thereby preventing such irregularity of cxp'ansion or contraction which Would make the periphery of the roller untrue. i

This improved roller does not become unduly heated and grinds and crushes as perfcctly at any time .of operation as it did at the beginning and which roller is simple in construction, strong, effective and reliableand not cxpensiffe/ In the accompanying drawings in which like letters of reference indicate'lilte parts in all the figures-Figure 1 is a perspective View of one embodiment of my improved crushing rollen-parts being broken away and'othersshovvn insection. Fig. 2 is a longitudinal sectional view. through the roller.

Fig..3 is a ltransverse sectional view on the line m'of Fig. 2. x The roller 1 is made ofchilled iron and is i in the form of a true cylinder with the two a ClOSGd. ends 2. It is cast with a core of vari* able diameter so that the bore of the cylinder is of variable diameter andthereforo the thickness of the peripheral or' cylindrical, wall is variable. As the greatest quantity of metalin cross section of the roller is 'found at the ends and the cooling water-is only in contact with the. inner surfaces of the ends, the water cannot cool these ends as much as it cools the peripheral Walls with which a greater quantity of Water is in contact. Therefore in order to prevent injurious expansion or contraction l. prefer to shape the core in such a manner that the diameter of the bore decreases from the ends of said bore towardk the central transverse plane ot' the cylinder so that the cylindrical wall will bethicker at the transverse central Bib lll'

- plane ot the roller than they arc at or adjacent'to the inner surfaces ofthe ends and l also prefer to shape the core in such a man` ncr that the thickness ot' the cylindrical walls gradually increases interiorly from the ends of thc boro toward thc longitudinal central transverse plane of the cylinder as shown for example in Fig. l, as thcreliy the distribution of metal such that the cooling effect of thc Water is substantially the same throughout the entire cylinder and consequently no undue or harmful contraction or expansion can take placewhich would tend to throw' the cylinder out of truc. The amount to which the thickness of the peripheral Wall `is increased at or near thc central transverse plane in relation to the thickness of the Walls at the `inner surface of the ends Vof course depends upo'n the di afmeter and length of the roller. For the 'purpose of introducing thelcooling Water and producing the perfect circulation of the i .same so that all parts of the bore come in Contact with the circulating cooling Water I prefer to fix the roller on ashaft 3 extcnding longitudinally throug'l'x the ends and bore of the cylinder which shaft is provided at each end with a central longitudinal conduit 4 which extends inward beyond the inncr surface of an end of the cylinder and by a short branch conduit 5 is brought into communication with the bore of the cylinder so that the cooling water can enter through one of' the conduits 4: of the shaft 3, then ict pass intofthe bore of the roller i and pass out through the conduit 4 at the vopposite end. of the' shaft '3 and in circuiating through said conduit cools the walls of the roller.-

Having described my invention what I claim as new and desire to'secure by Letters Patent lis: l. A' crushing roller having end hearings, a cylindrical outer surface and a bore of varying diameter, substantially as set forth.

2. A crushing lroller having end bearings,

`acylindrieai outer surface and a bore of varying diameter, means for circulating a cooling medium through said bore, substantially as set forth.

A crushing roller having end bearings, a cylindrical outer sur/face and a bore of less diameter at the central transverse plane of the cylinder than at the ends of said bore, whereby the thickness of the cylindrical walls ofthe roller are greater at the central transverse piane of the roller than at the ends, substantially as set forth.

4. A crushing roller having end bearings,

Hy decreasing in diameter from the ends of the roller towardV the .central transverse piane whereby the thickness of the cyiindricai walls of the roller gradually decrease from the central transverse piane toward the ends, substantially as set forth.

` The combination with a roller having a cylindrical outer surface and a bore gradua bore of varyingdiameter, of a shaft on MYRON A. SMITH. Vitnesses:

OSCAR F. GUNZ,

\PUL H.,FRANKn. 

